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Topic: Standard pressure

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	Atmospheric pressure - Wikipedia, the free encyclopedia (Site not responding. Last check: 2007-11-07)
		Standard atmospheric pressure or "the standard atmosphere" (1 atm) is defined as 101.325 kilopascals (kPa).
		This "standard pressure" is a purely arbitrary representative value for pressure at sea level, and real atmospheric pressures vary from place to place and moment to moment everywhere in the world.
		Atmospheric pressure is often measured with a mercury barometer, and a height of approximately 30 inches of mercury is often used to teach, make visible, and illustrate (and measure) atmospheric pressure.
	www.secaucus.us /project/wikipedia/index.php/Atmospheric_pressure (1071 words)

	Atmospheric pressure
		Standard atmospheric pressure or "the standard atmosphere" (1 atm) is defined as 101,325 pascals = 101.325 kPa.
		Low atmospheric pressure systems are symbolized by an L on a weather map and are associated with areas of storminess and precipitation.
		High atmospheric pressure systems are symbolized by an H on a weather map and are associated with areas of clear weather.
	www.brainyencyclopedia.com /encyclopedia/a/at/atmospheric_pressure.html (382 words)

	Pressure
		Since static fluid pressure is determined by the fluid density and depth, the depth or height difference of a given liquid is commonly used for pressure measurement:
		This is indicative of the normal pressure drop in a flowing fluid from Poiseuille's law since the diameters of the top tube are the same at the left and right tubes.
		Since the static fluid pressure is dependent only upon density and depth, choosing a liquid of standard density like mercury or water allows you to express the pressure in units of height or depth, e.g., mmHg or inches of water.
	hyperphysics.phy-astr.gsu.edu /hbase/pman.html (538 words)

	Standard pressure (Site not responding. Last check: 2007-11-07)
		Druck Ltd Manufacturer of pressure transducers, transmitters, portable process calibrators, high speed pressure controllers, industrial deadweight testers and primary standard piston gauges.
		Manotherm German manufacturer of pressure gauges, chemical seals, thermometers, pressure transmitters and pressure transducers as well as pressure gauge test equipment.
		The Mini Pressure Gauge Company Manufactures and suppies pressure and temperature gauges from 23mm up to 300mm diameter conforming to BS EN837(1998) standard.
	www.serebella.com /encyclopedia/article-Standard_pressure.html (350 words)

	Pressure Settings
		Most pressure cooker recipes are made to cook at the standard of 15psi, in fact this setting is so common that most recipes don't even need to mention it.
		Pressure cookers that use less than 15 psi defeat the speed of cooking, cost more money in cooking fuel, and lessen the nutritional value of moods, not to mention wasting your valuable time.
		The most obvious differences between a standard, and nonstandard pressure cooker can be seen in longer cooking times, increased fuel bills, and a loss of important vitamins and nutrients in the food you cook and serve to your family.
	missvickie.com /workshop/pressure.html (1156 words)

	Pressure on Earth, Highest
		Pressure is not a fixed value; rather, it varies with environmental factors, such as altitude and temperature.
		The pressure of the atmosphere there is known to be extremely high, enough to filter the sun's UV rays.
		Pressure plays a big role in our everyday lives as it helps us determine weather patterns, which may be especially useful for aircraft workers and people with weather dependent professions.
	www.hypertextbook.com /facts/2005/FlorenceHang.shtml (413 words)

	Pressure (Site not responding. Last check: 2007-11-07)
		Rugged and reliable for the meaurement of low pressures from 0-2" H20 (5 mbar) upto 100 psi or 7 bar, either vented gauge or wet/dry differential in a variety of fluid media.
		This series is suitable for measurement of liquid or gas pressure, even for difficult media such as contaminated water, steam, and mildly corrosive fluids or gases.
		The standard version is suitable for many applications, but the dedicated design team at our Transducer Engineering Center stands ready to provide a semi-custom design where the volume and application warrants.
	www.appliedmeasurement.com.au /pages/pressure.html (904 words)

	Pressure
		The decrease in atmospheric pressure with height can be predicted from the barometric formula.
		This has been found to be convenient for recording the relatively small deviations from standard atmospheric pressure with normal weather patterns.
		The atmospheric pressure provides the force necessary to push the mercury up the evacuated tube.
	hyperphysics.phy-astr.gsu.edu /hbase/pman.html#atm (538 words)

	Pressure on Tides (Site not responding. Last check: 2007-11-07)
		A rough guide is that a change in pressure of one millibar (one hectopascal in modern units) will change the sea level by one centimetre.
		This means that a pressure of 1040 mb, pretty high but not abnormally so, could give a sea level lower by nearly 30 cms than expected.
		The highest pressure around the UK is about 1050 mb which would give sea levels about 40 cm lower.
	www.franksingleton.clara.net /pressure_and_tides.html (245 words)

	Standard Blood Pressure Kit and Cuffs - Amplestuff - Plus-Size Products and Bariatric Resources (Site not responding. Last check: 2007-11-07)
		This model is a traditional type with stethoscope, pressure gauge, squeezebulb and standard-sized cuff for upper arms measuring from 10" to 14" in circumference, with vinyl carrying case.
		However, for most people, a standard cuff works well, and they do not experience any discomfort, or their discomfort is not enough to justify the much higher price of the deluxe cuffs.
		Without this cuff, blood pressure measurements can only be taken on the forearm--a valid method if done properly, but one that some healthcare professionals prefer not to use because they are not very familiar with it.
	amplestuff.safeshopper.com /42/cat42.htm?276 (454 words)

	052 Pa. Code § 59.15. Measurement of gas at higher than standard service pressure. (Site not responding. Last check: 2007-11-07)
		If gas is measured to customers through displacement meters at a pressure greater than standard service pressure, the meters shall be equipped with reliable pressure-volume recording gauges or other devices for accurately determining the quantity of gas which has passed through the meter in accordance with contract or tariff provisions.
		In computing the volume of gas at a given pressure base from a pressure-volume chart, the multiplier shall be obtained by the weighted average method, which consists of determining the average pressure for each indicated unit volume on the chart.
		In computing the volume of gas at a given pressure base from an orifice meter chart, the average static pressure and the average differential pressure shall be determined for periods not exceeding 1 hour.
	www.pacode.com /secure/data/052/chapter59/s59.15.html (480 words)

	Standard Pressure
		A unit of pressure: the pressure that will support a column of mercury 760 mm high at sea level and 0 degrees centigrade.
		In meteorology, usually a pressure of 1000 millibars, but other pressures may be used as standard for specific purposes.2.
		Specialty definitions using "standard pressure": FUEL ATTENDANT ♦ potential density, Potential Temperature &diams; sound exposure level, standard temperature and pressure.
	www.websters-online-dictionary.org /st/standard+pressure.html (241 words)

	Standard temperature and pressure (Site not responding. Last check: 2007-11-07)
		In chemistry, the term standard temperature and pressure (abbreviated STP) denotes an exact reference temperature of 0°C (273.15 K) and pressure of 1 atm (defined as 101325 Pa).
		In aviation, standard temperature and pressure at sea level are 15°C and 29.92 in.
		When used to calculate performance at any pressure altitude other than sea level, the temperature is adjusted using the dry adiabatic lapse rate.
	www.fact-index.com /s/st/standard_temperature_and_pressure.html (117 words)

	Industrial Control
		Standard Pressure Controls shipped from the factory are set at the maximum operating range and minimum differential.
		Surge pressures within published values generated during start-up or shut-down of a machine or system, not exceeding 8 times in a 24-hour period, are negligible.
		Standard Pressure Difference Controls shipped from the factory are set at the maximum adjustable difference range and minimum differential.
	www.ab.com /en/epub/catalogs/12768/229240/2286210/3073811/229274/tab6.html (1940 words)

	[No title]
		Increasing the pressure on a gas forces the molecules closer together, causing the volume to decrease in proportion to the increase in pressure (Boyle’s Law).
		These three factors — temperature, pressure, and the relative degree of saturation of the gas with water vapor — must be considered when gas volumes are compared under different environmental conditions and used subsequently in metabolic and physiologic calculations.
		To reduce a gas to standard dry (SD) conditions, the effects of water vapor pressure at the particular environmental temperature must be subtracted from the volume of gas.
	www.umich.edu /~exphysio/mvs.340/MVS340Lab.f04/LabAssig1.MetabCalc.doc (1361 words)

	Sound Intensity
		Since audible sound consists of pressure waves, one of the ways to quantify the sound is to state the amount of pressure variation relative to atmospheric pressure caused by the sound.
		The standard threshold of hearing can be stated in terms of pressure and the sound intensity in decibels can be expressed in terms of the sound pressure:
		The nominal dynamic range of human hearing is from the standard threshold of hearing to the threshold of pain.
	hyperphysics.phy-astr.gsu.edu /hbase/sound/intens.html (493 words)

	Standard Pipe Pressure Classes - American Ductile Iron Pipe - ACIPCO
		Calculations result in net thicknesses and are based on a minimum yield strength in tension of 42,000 psi and 2.0 safety factor times the sum of working pressure and 100 psi surge allowance.
		These are standard pressure classes as given in AWWA C150 and C151.
		The bolded numbers denote the depths of cover resulting from the pipe thickness being governed by deflection in the design; these covers are greater due to the design deflection of 5% for flexible-lined pipe instead of 3% for cement-lined pipe.
	www.acipco.com /adip/pipe/pressures-weights/pandw.cfm (492 words)

	Ductile Iron Pipe Research Association - DIPRA - Nominal Thicknesses for Standard Pressure Classes of Ductile Iron Pipe (Site not responding. Last check: 2007-11-07)
		Pressure classes are defined as the rated water working pressure of the pipe in psi.
		The thickness shown above are adequate for the rated water working pressure plus a surge allowance of 100 psi.
		Calculations are based on a minimum yield strength in tension of 42,000 psi and 2.0 safety factor times the sum of working pressure and 100 psi surge allowance.
	www.dipra.org /ductile/classes.html (143 words)

	Standard Temperature And Pressure (Site not responding. Last check: 2007-11-07)
		and with it attaining a global standard, it is...
		The chemical term standard ambient temperature and pressure (SATP) denotes 25°C and 100 kPa.
		When used to calculate performance at any pressure altitude other than sea level, the temperature is adjusted using the prescribed dry adiabatic lapse rates (which are -6,5°C/km for the first 11 km).
	www.wikiverse.org /standard-temperature-and-pressure (307 words)

	Standard pressure (Site not responding. Last check: 2007-11-07)
		In chemistry, the term standard temperature and pressure(abbreviated STP) denotes an exact reference temperature of0° C (273.15 K) and pressure of 1 atm (defined as 101.325 kPa).
		The chemical term standard ambient temperature and pressure (SATP) denotes 25°C and 100kPa.
		Whenused to calculate performance at any pressure altitude other thansea level, the temperature is adjusted using the prescribed dry adiabatic lapse rates (which are -6,5°C/km for the first 11 km).
	www.therfcc.org /standard-pressure-127013.html (190 words)

	Standard temperature and pressure
		In chemistry, the term standard temperature and pressure (abbreviated STP) denotes an exact reference temperature of 0°C (273.14 K) and pressure of 1atm (defined as 101325 Pa).
		These values approximate freezing temperature and atmospheric pressure at sea level.
		The text of this article is licensed under the GFDL.
	www.ebroadcast.com.au /lookup/encyclopedia/st/Standard_pressure.html (57 words)

	Physiological effects of alveolar, tracheal, and "standard" pressure supports -- Diehl et al. 87 (1): 428 -- Journal of ...
		Pressure was regulated by an electrovalve upstream from jet injector.
		Pressure and flow were measured at end of PS device circuit.
		the preset pressure was moved from the ventilator to the alveoli.
	www.jap.org /cgi/content/full/87/1/428 (4603 words)

	Pressure and Vacuum Standards
		The measurement uncertainty associated with the National Standard Barometer is approximately ±0.004 hPa but the uncertainty in the measurement of atmospheric pressure, by the on-line transducer, is considerably higher at approximately ±0.3 hPa.
		Note that, when estimating a pressure value from the graphs, the uncertainty will be considerably higher than that of the measuring transducer because of limitations in screen resolution.
		When using the pressure values, particularly for checking another barometer, it is important to appreciate that the differences in altitude, distance from Teddington and weather conditions may seriously limit the validity of the comparison.
	www.npl.co.uk /pressure/pressure.html (344 words)

	Transmitters offer low-cost pressure measurement: News from Sensortechnics
		Pressure transmitters offer low-cost pressure measurement from 6 to 550 bar, use the latest in ASIC technologies and deliver a total typical accuracy of +/-1 % full scale.
		The new MLH pressure transmitters from Honeywell, represented in Europe by Sensortechnics, offer low-cost pressure measurement from 50 to 8000 lb/in2 (6 to 550 bar).
		MLH pressure transmitters are ideal for a wide variety of demanding customer applications such as pumps and compressors, HVAC and refrigeration, engines, brake systems and general measurement of hydraulic fluids and pneumatics.
	www.manufacturingtalk.com /news/sen/sen110.html (354 words)

	USATODAY.com (Site not responding. Last check: 2007-11-07)
		The standard atmosphere can be thought of as the average pressure, temperature and air density for various altitudes.
		It also shows in a general way the pressures and temperatures to be expected at various altitudes.
		The standard atmosphere is based on mathematical formulas that reduce temperature and pressure by certain amounts as altitude is gained.
	www.usatoday.com /weather/wstdatmo.htm (207 words)

	Unisys Weather: Vertical Coordinate - Pressure (Site not responding. Last check: 2007-11-07)
		Meteorology uses pressure as the vertical coordinate and not height.
		Pressure decreases in the atmosphere exponentially as height increases reaching 0 pressure in space.
		The standard unit of pressure is millibars (mb or hectopascals-hPa) of which sea level is around 1015 mb.
	www.weather.unisys.com /info/press.html (85 words)

	Quality upgrade runs ahead of the pack: News from Pressure Systems
		Pressure Systems was originally certified against the 1994 standard in June 1995, and successfully maintained the certification through surveillance audits conducted every six months, as well as through reviews conducted every three years.
		On learning of the new standard, Pressure Systems formulated a two-year plan to achieve accreditation beginning in January 2001.
		According to quality control Manager Steve Wood, Pressure Systems' customer service, sales, and support staff will conduct these surveys and compile the data for internal reporting, in order to ensure continuous improvement.
	www.engineeringtalk.com /news/psu/psu102.html (440 words)

	STANDARD TEMPERATURE AND PRESSURE CALCULATOR (Site not responding. Last check: 2007-11-07)
		ALWAYS use liters, Degrees Kelvin and pressure in torr for these calculations.
		Standard Temperature of 273.15 Degrees Kelvin and a
		Here is an example of determining volume at Standard Temperature and Pressure and the number of moles of gas in a given volume.
	www.1728.com /stp.htm (186 words)

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